Crj-200 first officer reported executing two go-arounds at lax; one directed by ATC; the other after...

Narrative:

On approach to lax runway 24R we were in trail of a [heavy transport aircraft]. To mitigate wake turbulence we briefed and were flying above the glide path of the super. Near the final approach fix ATC cancelled our approach and turned us to the north. They brought us around and rejoined the approach behind another heavy so we were still planning to stay above the glide path. Near 500 feet AGL the approach became unstable with a high sink rate and we performed a go-around. At that time we received a cas miscomp message and continuous alert horn. After the executing the missed the captain took control and we worked through the message but could not silence the horn. Coming around for another approach there was confusion in communications as to what runway we were assigned due to the alert tone. When we identified that we both heard differing runway assignments it was too late to safely line up and land so we aborted the approach and went around. Coming around there were no further issues and we safely landed.unstable approach caused by improper correction during wake turbulence avoidance. Communication difficultly caused by alert horn distracting and disrupting communications. [Suggest] quickly correcting to variations in descent rates. Communicating and verifying runway assignments when changes are made; especially when other distractions are present.

Original NASA ASRS Text

Title: CRJ-200 First Officer reported executing two go-arounds at LAX; one directed by ATC; the other after an unstabilized approach due to avoiding potential wake turbulence.

Narrative: On approach to LAX Runway 24R we were in trail of a [Heavy Transport aircraft]. To mitigate wake turbulence we briefed and were flying above the glide path of the Super. Near the final approach fix ATC cancelled our approach and turned us to the north. They brought us around and rejoined the approach behind another heavy so we were still planning to stay above the glide path. Near 500 feet AGL the approach became unstable with a high sink rate and we performed a go-around. At that time we received a CAS miscomp message and continuous alert horn. After the executing the missed the Captain took control and we worked through the message but could not silence the horn. Coming around for another approach there was confusion in communications as to what runway we were assigned due to the alert tone. When we identified that we both heard differing runway assignments it was too late to safely line up and land so we aborted the approach and went around. Coming around there were no further issues and we safely landed.Unstable approach caused by improper correction during wake turbulence avoidance. Communication difficultly caused by alert horn distracting and disrupting communications. [Suggest] quickly correcting to variations in descent rates. Communicating and verifying runway assignments when changes are made; especially when other distractions are present.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1413132
Time
Date	201612
Local Time Of Day	1201-1800
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Widebody Low Wing 4 Turbojet Eng
Operating Under FAR Part	Part 129
Flight Phase	Landing
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Inflight Event / Encounter Unstabilized Approach

Crj-200 first officer reported executing two go-arounds at lax; one directed by ATC; the other after an unstabilized approach due to avoiding potential wake turbulence.